Huang Cing-Yi, Chang Kuo-Chih, Chu Shu-Chun
Department of physics, National Cheng kung University, No.1, University Road, Tainan City 701, Taiwan.
Materials (Basel). 2019 Jul 10;12(14):2226. doi: 10.3390/ma12142226.
A new type of laser system, known as a digital laser, was proposed in 2013. Many well-known laser beams with known analytical forms have been successfully generated in digital lasers. However, for a light field that does not have an analytical form, such as a multi-point light field or a light field with an arbitrary lateral distribution, how to generate such a light field from a digital laser has not been explored. The goal of this study was to experimentally explore how to generate an on-demand lateral laser field in a digital laser. In this study, a multi-point Gaussian laser beam was successfully generated in a digital laser by both controlling the range of the laser gain and the modulation of the phase boundary of the end of the cavity. This study then generated laser beams with an on-demand lateral field distribution by generating a superimposed multi-point laser field in a digital laser. Examples of triangles, rectangles, and letter T-shaped light fields produced by digital lasers were experimentally demonstrated. In summary, this study experimentally showed that a laser beam with an on-demand lateral field distribution could be generated in a digital laser by generating a superimposed multi-point laser field in a digital laser, in which a laser gain region covering the entire intra-cavity multi-point light field and the projected SLM (spatial light modulator) modulation function adopting a mimic amplitude mask are both used.
一种新型的激光系统，即数字激光器，于2013年被提出。许多具有已知解析形式的知名激光束已在数字激光器中成功产生。然而，对于没有解析形式的光场，如多点光场或具有任意横向分布的光场，如何从数字激光器中产生这样的光场尚未得到探索。本研究的目的是通过实验探索如何在数字激光器中产生按需横向激光场。在本研究中，通过控制激光增益范围和腔端相位边界的调制，在数字激光器中成功产生了多点高斯激光束。然后，本研究通过在数字激光器中产生叠加的多点激光场，生成了具有按需横向场分布的激光束。实验展示了数字激光器产生的三角形、矩形和字母T形光场的实例。总之，本研究通过实验表明，在数字激光器中通过产生叠加的多点激光场，可以产生具有按需横向场分布的激光束，其中使用覆盖整个腔内多点光场的激光增益区域和采用模拟振幅掩模的投影空间光调制器（SLM）调制函数。
